Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Jun. 30, 2014	Dec. 31, 2013
Condensed Consolidated Balance Sheets
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized (in shares)	4,000,000,000	4,000,000,000
Common stock, issued (in shares)	1,605,362,435	1,594,260,996
Common stock held in treasury (in shares)	13,663,311	6,900,434